Abstract
Here, we report on the high-performance blue quantum dots (QDs) light-emitting diodes (QLEDs), in which the ZnO nanoparticles (NPs) are employed as the electron transport layer (ETL) and optimized with different alcohol solvents. The experimental results demonstrate that the properties of solvent used for ZnO NPs—such as polarity, viscosity and boiling point—play a crucial role in the quality of film where they modulate the electron injection across the QDs/ETL interface. The maximum current efficiency of 3.02 cd/A and external quantum efficiency (EQE) of 3.3% are achieved for blue QLEDs with ZnO NPs dispersed in butanol, exhibiting obvious enhancement compared with the other solvents. This work provides a new method to select proper solvent for ETL which can further improve the device performance.
Highlights
Our results indicate that QLEDs with butanol used for ZnO NPs achieve the highest performance because they have the best dispersion property and film quality, leading to the maximum current efficiency of
The ZnO NPs were synthesized as follows: first, a solution of 0.5 M tetramethylammonium hydroxide (TMAH) in ethanol was added to 0.1 M zinc acetate in dimethyl sulphoxide (DMSO)
InInconclusion, can report on on an efficient method of solvent optimization to improve conclusion,wewe can report an efficient method of solvent optimization to imthe performance of blue
Summary
Publisher’s Note: MDPI stays neutral with regard to jurisdictional claims in published maps and institutional affiliations. Quantum dots (QDs) have attracted much attention in the past few years because they possess unique properties, such as bandgap tunability, high photoluminescent quantum yield (QY), narrow full width at half maxima (FWHM), low-cost solution processing, and compatibility with flexible substrates [1,2,3,4,5,6,7] Owing to these features, QDs have been extensively investigated for use in optoelectronic devices, such as light-emitting diodes (LEDs) [8], lasers [9], photodetectors [10], and solar cells [11]. Our work provides a simple but reliable method of improving the blue QLEDs performance
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